I just viewed a presentation on Macromedia Central, linked from Anil Dash's site. It seems to be a launching tool for Flash applications, with a bit of UI for connecting them together. Reminded me a bit of Mozilla Firebird's Extensions system, which also supports installling applications that do Web services, and sharing data and so on, as the presentation describes are features. Macromedia Central also seems to want in on the Watson/Sherlock territory.
However, it breaks Neil's Fundamental Law of Products: Never trust a product with marketing materials that contain the word synergy.